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https://issues.apache.org/jira/browse/HDFS-13614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16530172#comment-16530172
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Wei-Chiu Chuang commented on HDFS-13614:
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We're seeing the exact same exception, but between DataNode and a client (an
Apache Impala Impalad). Effectively it caused the Impalad to hang because all
threads blocked on accessing the socket, until it was restarted. Somehow they
didn't timeout, possibly due to HADOOP-15530. Exactly how this NPE led to the
hang behavior is still unknown.
Relevant information: CDH5.12.1 (Hadoop 2.6.0 based, Impala 2.9.0 based) JDK
1.8.0 162.
> DN failed to connect with NN because of NPE in SocketIOWithTimeout
> ------------------------------------------------------------------
>
> Key: HDFS-13614
> URL: https://issues.apache.org/jira/browse/HDFS-13614
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.7.2
> Reporter: Surendra Singh Lilhore
> Priority: Major
>
> {{LinkedList$ListItr.next()}} is throwing NPE in {{SocketIOWithTimeout}}.
> Because of this socket connections are failing. It may be java bug also..
> [https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8133715]
>
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